Peel and core 5 pounds apples, then cut into small chunks. Place the diced apples in a large saucepan or pot.
Add 1 cup water, 2 tablespoons lemon juice, and 1 whole cinnamon stick. Cover and bring to a boil over high heat.
Reduce heat to low, cover, and simmer for 20 to 30 minutes, stirring occasionally, until the apples are soft.
Remove the cinnamon stick and blend using a blender, food processor, or immersion blender. Blend until smooth or leave some chunks, depending on personal preference.
Optional: For a sweetened applesauce, return the puree to the pot and stir in 1/2 cup brown sugar. Cook uncovered over low heat for about 10 minutes, stirring occasionally, until thickened. For a richer, dessert-like applesauce, stir in 2 tablespoons butter, 1/2 teaspoon ground cinnamon, and 1/2 teaspoon vanilla extract until the butter melts completely.
Serve warm or chilled. Store in an airtight container in the refrigerator for up to 2 weeks. For long-term storage, freeze in airtight containers for up to 6 months.
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Notes
Instant Pot: Add all ingredients to the pot. Seal and cook on high pressure for 10 minutes, then allow a natural release.
Slow Cooker: Combine ingredients and cook on high for 3-4 hours or until apples are soft.
Pear or Strawberry Blends: Swap out up to half of the apples with ripe pears for apple-pear. For a strawberry blend, add 1 cup chopped strawberries during the last 10 minutes of cooking.